Godox QS400II Specs Flash Head Maximum Power 400 Ws Power Control 6 Stops in 1/10-Stop Increments Guide Number 213′ / 65 m at ISO100 Flash Duration 1/2000 to 1/800 Sec Recycle Time 0.3 to 1.5 Sec Color Temperature 5600K ± 200K Flash Ready Indicator Audio Reflector Changeable Accessory Fitting Type Bowens S Type Modeling Light Type Tungsten Wattage 150 W Control Modes Free Set, Off, Proportional Sync Sync Type Button, Cable, Optical, Radio Built-In Wireless Receiver Yes Wireless Frequency Bands 2.4 GHz Wireless Channels / Groups 32 / 16 Power AC Input Power 100 to 120 VAC, 60 Hz Fuse 5 A General Display None Fan Cooled No Dimensions H: 10.2 x W: 5.5 x L: 16.1″ / H: 26.0 x W: 14.0 x L: 41.0 cm, Including Cap and Handle Weight 6.0 lb / 2.75 kg Packaging Info Package Weight 10.15 lb Box Dimensions (LxWxH) 18.7 x 10.9 x 8.6″